Tube beader



March 15, 1927. 1,621,128

E. MOHRLIN TUBE BEADER Filed March 6. 1925 2 Sheets-Sheet 1 March 15; 1927.

' E. MOHRLIN TUBE @EADER Filed March a. 1925 I 2 Sheets-Sheet 2 v 1.7% we): 0.1

Patented Mar. '15, 1927.

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EMIL monanm, or srurrcanr-nnennnocn, GERMANY, assrenon To run rrmv'r monnnm e; M. is.

1-1., OF ST'UTTGART, GERMANY TUBE BEADER.

Application filed March 6, 1925, Serial No. 13,487, and in Germany March 10, 1924.

My invention relates to means for simultaneously expanding and beading tube ends in flanges and the efiicient manner.

It has already been proposed toperform the expanding and the beading in a single operation and withthe aid of a smgle tube beader, having rollers which at the same time permitted expanding and beading the end of the tube in the flange hole.

However this mode of proceeding is unsatisfactory inasmuch as a conical mandrel inserted in the tube so as to gradually force the rollers against its walls will not cooperate with bead rollers. Specially shaped mandrels are therefore required which not only increase the first cost of the header and interfere with the facility of its operation but also involve the further drawback that the beader cannot be used for tubes of as many different diameters as is possible with the usual beader. Moreover the products are inferior inasmuch as the diameters of the contacting surfaces are not equal.

In order to overcome this drawback it has been proposed to combine two sets of rollers of a difierent kind, one set performing the expanding, the other the heading of the tube ends, but in this case a ridge was formed between the parts acted on by the difierent rollers.

It is an object of my invention to over come these drawbacks and to provide a tube beader which may be used within a very wide range of tube diameters and equipped with the usual conical mandrel, and is capable of performing the rolling-in and beading operations in a single operation and'to per fection from the technical and economical point of view.

My invention comprises the provision of a separate beading roller or rollers which are independent of the expanding rollers. The end face of the beading roller abuts against the corresponding face of the adjacent expanding roller and the beading roller is arranged eccentrically to the expanding rollers, the eccentricity being so determined that on the inside of the setof rollers the beading and expanding rollers both rotate on the conical surface of the mandrel while on the outside the beading roller projects beyond the expanding rollers. In this maner the beading roller on like in an easier and more the one hand and the expanding rollers on the other hand are free to rotate as required for the operation to be performed by each of them and at the same time they are supported by the mandrel which may be of the usual conical form and of any suitable length.

In the drawings affixed to this specifica tion and forming part embodying my invention are illustrated diagrammatically by way of example.

Iii-the drawings,

Fig. 1 is a side elevation, partly in longitudinal section along the axis of one set'of rollers, L

Fig. 2 is an elevation, partly in section, showing the arrangement ofthe set of rollers,

Fig. 3 is a cross-section on'line 83 in Fig. 2, 1

Fig. .4 is a diagrammatic elevation illustrating a modified method of roller support, and Y I Fig. 5 Fig. 4c. p

Referring first to Figs. 1 to 3, a is'the head of the implement to which rotation is imparted. by suitable means (not shown).

is a cross-section on line 5-5 in thereof, two devices The head is provided with radial guides a in which slides 12 are mounted for reciprocation. Pins 0 are-secured to the guides and expanding rollers d and a beading roller 6 is rotatably mounted on the pin and retained 1 f is so deof rollers the bead- I 7 ing roller 6 projects beyond the expanding rollers at so that the desired section is obtained at the mandrel'g. The the tube during mannen.

mandrel is advanced into The modification here described is particularly suitable for tubes of comparatively large diameter. For tubes of small diameter the modification disclosed in Figs. 4: and 5 is preferred- Here holders h are secured on the ends 0 of the pins 0 which are mounts the operation in the usual I end of the tube, while on the inside all the rollers are in contact with the;

-' ,ed in slides on a head such as described with reference to Figsrl to 3, but fort-he sakeof clearness these parts are not shown 111 Fig. 4.

The holder h is provided With a yokeshaped extension it in which are mounted the expanding rollers d. and the beading roller 6. The rollers rotate in contact With the mandrel g as described and ballsi, 2' may be inserted between the ends of the rollers and the corresponding ends of the yoke 72.. p

I' Wish it to be understood that I do notdesire to' be limited to the exact details of construction shown and described, for ob- I vlous modifications will 7 occur to a person skilled 1n the ar' Y V I cla1m:

1. Tube bea'd'er comprising a head, a radial guide on said head,a slide adapted to be displaced in said guide, an expanding roller and a beading roller rotatably carried on said o slide, said beading roller being mounted ec V displacedin said centrically with regard to said expanding displac- 3. Tube beader comprising a head, a rahead, a slide adapted to dial guide on said guide, a yoke'secured on be displaced in said said slide, and expanding rollerand a beading roller mounted in said yoke, said beading roller being mounted eccentrically with regard to said expanding roller, and means for transversely displacing said rollers an'dsaid slide. i I

In testimony whereof I aflix my signature.

E." MOHRLIN.

means for transversely dis- 

